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Black Bryony, Tamus communis, is all over the place in the woods and hedgerows, twining its vines clockwise through and around its supporting vegetation, though I only ever seem to notice it in autumn. It has distinctive heart shaped leaves, but even more distinctive strings of berries that start lime green and ripen through to yellow-orange-scarlet. It is from the yam family, and completely unrelated to white bryony Brionia dioica, which is related to another vegetable, the marrow.
